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[RFA:] Improve cgen/doc/rtl.texi wrt. timing and PROFILE.
- From: Hans-Peter Nilsson <hans-peter dot nilsson at axis dot com>
- To: cgen at sources dot redhat dot com
- Date: Sat, 30 Nov 2002 09:24:57 +0100
- Subject: [RFA:] Improve cgen/doc/rtl.texi wrt. timing and PROFILE.
Slight improvements to the documentation, I hope.
By the way, it seems toplevel configury does not create a
cgen/Makefile, necessary for "make info" to take effect, even
though nothing else is created object-wise. Needs fixing.
Ok to commit?
* doc/rtl.texi (Model variants): Mention current limitations for
unit inputs and outputs.
(Hardware elements) <attribute PROFILE>: Be slightly more
verbose.
(Instructions) <timing>: input/output overrides have a direction
operand.
Index: rtl.texi
===================================================================
RCS file: /cvs/src/src/cgen/doc/rtl.texi,v
retrieving revision 1.15
diff -c -p -r1.15 rtl.texi
*** rtl.texi 29 Jan 2002 22:51:52 -0000 1.15
--- rtl.texi 30 Nov 2002 08:13:20 -0000
*************** function unit called @samp{u-cmp} is def
*** 755,761 ****
This handles instructions that use src1 and src2 as operands. The
organization of units is arbitrary. On the M32R, src1/src2 instructions
are typically compare instructions so a separate function unit was
! created for them.
@node Hardware elements
@section Hardware Elements
--- 755,763 ----
This handles instructions that use src1 and src2 as operands. The
organization of units is arbitrary. On the M32R, src1/src2 instructions
are typically compare instructions so a separate function unit was
! created for them. Current limitations require that each hardware item
! behind the operands must be marked with the attribute @code{PROFILE} and
! the hardware item must not be scalar.
@node Hardware elements
@section Hardware Elements
*************** with @code{VIRTUAL} (??? revisit).
*** 813,820 ****
@item PROFILE
! Ignore. This is a work-in-progress to define how to profile references
! to hardware elements.
@item VIRTUAL
--- 815,823 ----
@item PROFILE
! This attribute must be present for hardware elements to which references
! are profiled. Beware, this is work-in-progress. If you use this
! attribute it is likely you have to hack CGEN. (Please submit patches.)
@item VIRTUAL
*************** that supports the instruction. The defa
*** 1866,1879 ****
The syntax is:
@example
! (mach-name (unit name (unit-var-name1 insn-operand-name1)
! (unit-var-name2 insn-operand-name2)
...
(cycles cycle-count))
@end example
! unit-var-name/insn-operand-name mappings are optional.
! They map unit inputs/outputs to semantic elements.
@code{cycles} overrides the @code{done} value (latency) of the function
unit and is optional.
--- 1869,1885 ----
The syntax is:
@example
! (mach-name (unit name (direction unit-var-name1 insn-operand-name1)
! (direction unit-var-name2 insn-operand-name2)
...
(cycles cycle-count))
@end example
! direction/unit-var-name/insn-operand-name mappings are optional.
! They map unit inputs/outputs to semantic elements. The
! direction specifier can be @code{in} or @code{out} mapping the
! name of a unit input or output, respectively, to an insn
! operand.
@code{cycles} overrides the @code{done} value (latency) of the function
unit and is optional.
brgds, H-P